Untitled

<!DOCTYPE html>
<html lang="de">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Titel</title>
  </head>
  <body>

  </body>
  <script>

    var ws = new WebSocket('wss://echo.websocket.org');

    ws.onopen = () => {
        // connection opened
        ws.send('something'); // send a message
    };

    ws.onmessage = (e) => {
        // a message was received
        console.log(e.data);
    };

    ws.onerror = (e) => {
        // an error occurred
        console.log(e.message);
    };

    ws.onclose = (e) => {
        // connection closed
        console.log(e.code, e.reason);
    };
  </script>
</html>